One thing I would never do is cheap out with cheap brakes. Especially hydraulic brakes that have to deal with fluid under hi pressure (and not start leaking). If I went this cable/hydro hybrid route, I would do Juin Tech M1's. In fact I already did for my daughter and son-in-law who had hi powered fat bikes that suffered from the usual cable-stretching that happens with big, fast ebikes. They were very well made.
At $170 for two of them, they are also four times the cost of the Catazer and similar brakes.
However, the guy I bought my Juin Techs from has them on sale for $113 for a set.
area13ebikes.com
Read the Catazer 1-star reviews. Seems like a fairly consistent problem of the fluid seals not lasting.